Under Counting One's Marbles (in Probability) Posted on 2008-02-18 (5 Comments) |

| Solution by Eric (2008-02-21 03:39:38) |

Under Urn, urn, urn (in Probability) Posted on 2007-02-20 (5 Comments) |

| Solution by Eric (2007-02-20 22:30:41) |

Under Fifteen Jumbled (in Sequences) Posted on 2006-12-29 (7 Comments) |

| The Color of Money (Spoiler!!) by Eric (2006-12-29 19:59:23) |

Under The art of fencing (in Shapes) Posted on 2006-12-27 (6 Comments) |

| Five Neighbours by Eric (2006-12-27 18:17:51) |

| re: idea by Eric (2006-12-27 16:18:16) |

Under Square Search (in General) Posted on 2006-12-21 (3 Comments) |

| re: heuristic computer exploration and Solution by Eric (2006-12-21 15:55:49) |

Under A quaint incongruent integral partitioning conundrum (in Shapes) Posted on 2006-12-20 (2 Comments) |

| re: Ceiling by Eric (2006-12-20 15:54:43) |

| Ceiling by Eric (2006-12-20 15:34:14) |

Under Horoscope Hijinks II (in General) Posted on 2006-12-05 (2 Comments) |

| Solution by Eric (2006-12-05 14:18:44) |

Under Parallel Bisections (in Geometry) Posted on 2006-11-27 (3 Comments) |

| Solution by Eric (2006-11-27 12:23:47) |

Under Angle Trisection (in Geometry) Posted on 2006-11-09 (6 Comments) |

| Partial Solution by Eric (2006-11-09 21:18:59) |

Under Going Downtown (in Logic) Posted on 2006-11-08 (7 Comments) |

| re: Solution by Eric (2006-11-08 22:23:55) |

Under Favorable Numbers (in Numbers) Posted on 2006-11-02 (4 Comments) |

| Solution by Eric (2006-11-02 12:14:47) |

Under The Holy Cannoli (in Shapes) Posted on 2006-11-01 (7 Comments) |

| re(2): Integrating the other way by Eric (2006-11-01 20:18:51) |

| Integrating the other way by Eric (2006-11-01 18:42:00) |

Under A Fourth Person Problem (in Liars and Knights) Posted on 2006-11-01 (16 Comments) |

| re: Solution by Eric (2006-11-03 15:52:44) |

Under Further Descending Integers (in Numbers) Posted on 2006-10-19 (2 Comments) |

| Solution by Eric (2006-10-19 16:12:58) |

Under On Target (in Geometry) Posted on 2006-10-09 (6 Comments) |

| Solution by Eric (2006-10-09 19:40:48) |

Under Sort of a sorting problem (in Just Math) Posted on 2006-08-22 (14 Comments) |

| re(2): For continuous functions... by Eric (2006-08-23 17:26:45) |

| For continuous functions... by Eric (2006-08-22 13:25:47) |

Under Summing or Multiplying (in Numbers) Posted on 2006-08-21 (20 Comments) |

| Peculiars vs. Primes by Eric (2006-08-22 16:32:36) |

Under Card game (in Games) Posted on 2006-08-12 (6 Comments) |

| Different Approach by Eric (2006-08-12 16:25:48) |

Under A Definite Integral Problem (in Calculus) Posted on 2006-08-10 (5 Comments) |

| Solution by Eric (2006-08-10 13:37:48) |

Under Land of Zoz (in Liars and Knights) Posted on 2006-07-17 (13 Comments) |

| Flaw Edit by Eric (2006-07-18 16:54:08) |

Under Darting on one leg (in Games) Posted on 2006-06-22 (4 Comments) |

| Answer by Eric (2006-06-23 18:48:58) |

| Question about Number 2 by Eric (2006-06-23 01:08:04) |

Under Covering a circle (extended mix) (in Shapes) Posted on 2006-06-20 (5 Comments) |

| re(2): Answers by Eric (2006-06-21 00:11:57) |

| Answers by Eric (2006-06-20 17:45:35) |

Under Fiction Novel And Science Book Problem (in Just Math) Posted on 2006-06-20 (5 Comments) |

| No brutes needed by Eric (2006-06-20 18:04:06) |

Under Arcanum (in Riddles) Posted on 2006-06-15 (16 Comments) |

| Numbers don't lie, but they sure are magical... by Eric (2006-06-15 23:46:25) |

Under Four Congruent Circles (in Geometry) Posted on 2006-06-14 (5 Comments) |

| Think BIG then small... like Alice by Eric (2006-06-14 23:43:16) |

Under The Ultimate Cribbage Hand (in Games) Posted on 2006-06-07 (21 Comments) |

| New Total by Eric (2006-06-07 23:40:52) |

| re(3): Part of the solution by Eric (2006-06-07 23:31:17) |

| re: A Fist Full by Eric (2006-06-07 23:24:21) |

| re: some help from the computer (spoiler) by Eric (2006-06-07 23:15:06) |

Under Trading Places 2D (in Algorithms) Posted on 2006-06-07 (3 Comments) |

| Ring around the rosy? by Eric (2006-06-08 00:49:06) |

Under The Island of Masyu (in Logic) Posted on 2006-06-06 (4 Comments) |

| Solution by Eric (2006-06-06 20:28:27) |

Under All Four Suits (in Probability) Posted on 2006-06-06 (8 Comments) |

| End... by Eric (2006-06-06 23:20:06) |

| Middle... by Eric (2006-06-06 21:46:17) |

| Beginning.. by Eric (2006-06-06 12:08:06) |

Under Tricky sudoku (in Logic) Posted on 2006-06-05 (7 Comments) |

| Answer by Eric (2006-06-05 13:05:36) |

Under Who? (in Cryptography) Posted on 2006-06-04 (7 Comments) |

| re(3): solution by Eric (2006-06-05 13:12:21) |

Under A Perfect Square Problem (in Just Math) Posted on 2006-06-03 (10 Comments) |

| re(2): i cant get it by Eric (2006-06-07 00:10:23) |

Under Relativistic snapshot (in Science) Posted on 2006-05-26 (11 Comments) |

| re(5): Solution by Eric (2006-06-07 00:21:52) |

Under The Paradox of Relativity (in Science) Posted on 2006-05-24 (9 Comments) |

| How I understand it... by Eric (2006-05-24 17:25:58) |

Under Kakuro, Sudoku AND Hanji combined (in Logic) Posted on 2006-05-16 (4 Comments) |

| Answer by Eric (2006-05-16 19:14:20) |

Under Garden Path (in Geometry) Posted on 2006-05-10 (11 Comments) |

| A bit of a stretch by Eric (2006-05-11 20:24:55) |

Under Tidy Triangle (in Shapes) Posted on 2006-05-05 (7 Comments) |

| re: If not different by Eric (2006-05-05 22:09:00) |

Under Gravity experiment (in General) Posted on 2006-05-04 (29 Comments) |

| re(3): Question by Eric (2006-05-08 16:23:30) |

| re(2): Question by Eric (2006-05-08 16:22:01) |

| re: Detailed Solution by Eric (2006-05-05 22:03:27) |

| Drop Plan Part I by Eric (2006-05-05 03:04:00) |

| Solution by Eric (2006-05-05 02:19:37) |

| First thought by Eric (2006-05-04 12:53:36) |

Under Classical Rules 2 (in Numbers) Posted on 2006-04-20 (3 Comments) |

| re: Partial Solution by Eric (2006-04-20 22:19:40) |

Under Some physics problems? (in Science) Posted on 2006-04-16 (13 Comments) |

| re(3): E = mc^2 by Eric (2006-04-17 06:44:01) |

Under Simple Origami? (in Shapes) Posted on 2006-03-07 (8 Comments) |

| re: refining the answer-computer solution by Eric (2006-03-08 02:13:16) |

Under Black and White Solids (in Geometry) Posted on 2006-03-04 (11 Comments) |

| re: #2- octahedron by Eric (2006-03-04 15:45:11) |

Under A Digital Permutation Problem (in Numbers) Posted on 2006-02-28 (3 Comments) |

| re: Solution - I'll spare you by Eric (2006-02-28 17:55:03) |

Under Angle ABC (in Geometry) Posted on 2006-02-25 (13 Comments) |

| re(2): An algebraic solution by Eric (2006-02-26 13:46:53) |

| An algebraic solution by Eric (2006-02-26 03:50:20) |

| re(2): Solution - This is how long it took me: by Eric (2006-02-25 15:15:52) |

| re: Solution - A little jumpy, don't you think? by Eric (2006-02-25 14:41:04) |

Under ABC - easy as 123 (in Cryptography) Posted on 2006-02-24 (15 Comments) |

| Spoiler by Eric (2006-02-24 13:58:57) |

Under Wolf in a field (in Algorithms) Posted on 2006-02-23 (17 Comments) |

| re(2): Okay, then prove this: by Eric (2006-02-23 23:11:16) |

| Okay, then prove this: by Eric (2006-02-23 16:29:02) |

Under Inversion Distance (in Geometry) Posted on 2006-02-21 (32 Comments) |

| re: Solution: I think I have it right now. by Eric (2006-02-26 04:11:53) |

| re(5): Note to Bractals by Eric (2006-02-25 14:13:42) |

| re(3): Note to Bractals by Eric (2006-02-25 03:08:26) |

| re: Note to Bractals by Eric (2006-02-23 23:34:25) |

| re: Disagreement by Eric (2006-02-23 16:13:58) |

| re(2): problem resolved by Eric (2006-02-22 17:08:39) |

| Now I have it. by Eric (2006-02-22 02:03:52) |

| re: special case? spoiler, perhaps by Eric (2006-02-22 01:50:11) |

| How do I explain this? by Eric (2006-02-21 18:25:24) |

Under The Infinite Drive (in Science) Posted on 2006-02-18 (5 Comments) |

| Muzzle velocity by Eric (2006-02-18 16:13:01) |

Under Pair of Quadrilaterals (in Shapes) Posted on 2006-02-17 (3 Comments) |

| Second Quadrilateral and Solution by Eric (2006-02-17 16:45:10) |

| First Quadrilateral by Eric (2006-02-17 16:35:10) |

Under I don't know. (in Cryptography) Posted on 2006-02-16 (52 Comments) |

| Three things... by Eric (2006-02-18 21:41:35) |

Under Hide and destroy (in Probability) Posted on 2006-02-15 (13 Comments) |

| Thoughts by Eric (2006-02-15 15:29:16) |

Under Spotty editing (in Probability) Posted on 2006-02-14 (13 Comments) |

| re(2): Assuming that ... by Eric (2006-02-15 01:21:58) |

Under Harmonic Integers (in Just Math) Posted on 2006-02-07 (5 Comments) |

| re: I think I have it by Eric (2006-02-08 03:19:25) |

Under Dafoe, The Lone Entrepreneur (in Just Math) Posted on 2006-01-30 (23 Comments) |

| re: Starting Point by Eric (2006-01-30 23:44:05) |

| Where I'm at by Eric (2006-01-30 23:33:01) |

Under Euclid Squared (in Sequences) Posted on 2006-01-26 (4 Comments) |

| Solution by Eric (2006-01-26 16:58:11) |

Under Odometer Sum of the Digits (in Numbers) Posted on 2006-01-19 (11 Comments) |

| re(2): computer solution by Eric (2006-01-19 19:54:03) |

Under Self-Referential Aptitude Test (in Logic) Posted on 2006-01-17 (28 Comments) |

| re(3): logic error by Eric (2006-01-28 16:11:17) |

| re: logic error by Eric (2006-01-23 13:51:50) |

| re: Solution? by Eric (2006-01-17 21:49:00) |

| Answers - no explanation by Eric (2006-01-17 14:01:40) |

Under Placing 20 pieces (in General) Posted on 2006-01-14 (4 Comments) |

| re: a solution by Eric (2006-01-15 22:51:21) |

Under Identify the chess pieces (in Games) Posted on 2006-01-09 (15 Comments) |

| re(4): Full Solution - not yet by Eric (2006-01-12 18:38:56) |

| re(3): Opening Moves (part spoiler) by Eric (2006-01-10 16:13:06) |

| re: Opening Moves (part spoiler) by Eric (2006-01-09 19:24:01) |

Under No honor among thieves (in Liars and Knights) Posted on 2006-01-08 (12 Comments) |

| No Subject by Eric (2006-01-08 12:12:47) |

Under Play it again, Sam (in General) Posted on 2006-01-06 (24 Comments) |

| re(3): Who is Sam? by Eric (2006-01-08 12:31:39) |

| re: Who is Sam? by Eric (2006-01-07 20:09:42) |

| Don't Read This Solution! - it is fun to solve. by Eric (2006-01-06 17:22:44) |

Under A Most Unusual Evaluation (in Just Math) Posted on 2006-01-04 (3 Comments) |

| re: Rigorous Solution by Eric (2006-01-05 23:34:30) |

Under F-A-C-E (in Word Problems) Posted on 2006-01-04 (8 Comments) |

| re: making a flash piano by Eric (2006-01-06 05:30:00) |

Under A rational cryptarithm (in Just Math) Posted on 2005-12-29 (17 Comments) |

| Equivalent Variables? by Eric (2005-12-29 14:53:05) |

Under Cubic Problem: Existence Of A Solution (in General) Posted on 2005-12-28 (8 Comments) |

| OK I think I pulled the gum out of my brain - Solution by Eric (2005-12-29 01:45:25) |

| Solution! by Eric (2005-12-28 19:37:31) |

Under More Referential Numbers (in Numbers) Posted on 2005-12-10 (3 Comments) |

| One longer number and some thinking... by Eric (2005-12-10 19:34:33) |

Under Boiling Impossibilities (in Science) Posted on 2005-12-06 (41 Comments) |

| Watcha got cookin'? by Eric (2005-12-07 03:46:09) |

Under Gone Fishin' (in Calculus) Posted on 2005-12-05 (5 Comments) |

| re: I hate to be a downer, but... by Eric (2006-01-26 22:11:59) |

Under Spinning disks (in Shapes) Posted on 2005-12-03 (6 Comments) |

| re: Hint | Spoiler by Eric (2005-12-07 03:26:40) |

| number of sectors by Eric (2005-12-03 16:36:02) |

Under The prisoners and the beans (in Logic) Posted on 2005-11-27 (38 Comments) |

| re(4):(by pcbouhid): by Eric (2005-12-08 17:24:37) |

| re(2):(by pcbouhid): by Eric (2005-12-08 04:03:27) |

| re: Assume that... by Eric (2005-11-30 20:22:03) |

| re(2): Prisoner's Dilemma Deluxe by Eric (2005-11-30 19:22:50) |

| Prisoner's Dilemma Deluxe by Eric (2005-11-30 02:00:36) |

Under Bat wings (in Shapes) Posted on 2005-06-08 (13 Comments) |

| re(2): Label the figure (Solution) by Eric (2005-06-09 15:58:17) |

Under An average table (in Just Math) Posted on 2005-06-03 (10 Comments) |

| re(2): Solution by Eric (2005-06-04 01:25:12) |

| Solution by Eric (2005-06-03 21:09:33) |

Under The Second Level (in Probability) Posted on 2005-04-26 (10 Comments) |

| Solution by Eric (2005-04-26 17:30:58) |

Under Colorful Noise (in Cryptography) Posted on 2005-04-25 (17 Comments) |

| re: meow... by Eric (2005-04-25 23:43:32) |

| Solution by Eric (2005-04-25 20:14:02) |

Under All the Marbles (in Logic) Posted on 2005-04-22 (18 Comments) |

| re(3): Answer + Solution (explanation) by Eric (2005-04-22 22:14:37) |

| Answer, no solution by Eric (2005-04-22 22:07:35) |

Under Graduation Day (in Liars and Knights) Posted on 2005-04-18 (5 Comments) |

| Step by Step Solution by Eric (2005-04-18 19:05:51) |

Under Tethered satellites (in Science) Posted on 2005-04-13 (13 Comments) |

| re: more thoughts by Eric (2005-04-13 22:59:39) |

Under It is infinite if it isn't? (in Paradoxes) Posted on 2005-04-12 (35 Comments) |

| Solution by Eric (2006-01-09 03:38:21) |

Under Essay Final (in General) Posted on 2005-04-08 (8 Comments) |

| Solution by Eric (2005-04-08 23:52:46) |

Under Passing Through (in Just Math) Posted on 2005-04-06 (27 Comments) |

| Solution by Eric (2005-04-06 19:33:19) |

Under Powerful Powers Pileup! (in Just Math) Posted on 2005-04-03 (3 Comments) |

| re: Intuitive guess by Eric (2005-04-04 20:32:08) |

Under Magic Keyring (in Sequences) Posted on 2005-03-28 (6 Comments) |

| Rest of Solution by Eric (2005-03-28 23:44:36) |

Under Two false coins (in Weights and Scales) Posted on 2005-03-25 (11 Comments) |

| Solution by Eric (2005-03-26 18:31:13) |

Under Clueless (in Numbers) Posted on 2005-03-14 (6 Comments) |

| re(3): Am I clueless? by Eric (2005-03-15 02:28:25) |

| re(2): Am I clueless? by Eric (2005-03-14 23:03:06) |

Under In the year 2525... (in Science) Posted on 2005-03-14 (9 Comments) |

| re(2): About Nine-tenths of an answer. by Eric (2005-03-14 14:40:21) |

Under Pretty Potent Primes (in Numbers) Posted on 2005-03-13 (11 Comments) |

| re: I think I've covered the possibilities--Computer Aided Solution by Eric (2005-03-13 18:17:46) |

Under Prime Perimeter (in Logic) Posted on 2005-03-11 (89 Comments) |

| re(2): Charlie's Skepticism by Eric (2005-03-12 17:00:06) |

| Charlie's Skepticism by Eric (2005-03-12 05:23:59) |

Under Fibonacci Fractions (in Just Math) Posted on 2005-03-09 (17 Comments) |

| Clear Solution by Eric (2005-03-10 06:40:39) |

Under Primal Magic Square (in General) Posted on 2004-03-09 (15 Comments) |

| re(2): lower square - failure by Eric (2004-03-09 21:23:50) |

Under Knight's Tour (2) (in Games) Posted on 2004-03-06 (9 Comments) |

| techniques by Eric (2004-03-06 14:20:30) |

Under Chess Board Switch (in General) Posted on 2004-02-28 (15 Comments) |

| re(3): A switch solution - maybe not the optimal one... by Eric (2004-03-06 12:44:15) |

| First Step by Eric (2004-02-28 12:58:51) |

| First Step by Eric (2004-02-28 12:58:50) |

Under A = B = AB (in Word Problems) Posted on 2004-02-10 (28 Comments) |

| one idea by Eric (2004-02-10 21:38:44) |

Under Annul Choke Widow Nude Whist (in Word Problems) Posted on 2003-12-27 (8 Comments) |

| re(2): Solution? by Eric (2003-12-27 14:09:36) |

Under Prime real estate (in Sequences) Posted on 2003-12-24 (4 Comments) |

| very slowly indeed by Eric (2003-12-24 19:08:07) |

Under Non - Zero Digit (in Just Math) Posted on 2003-12-21 (11 Comments) |

| maybe not everyone... by Eric (2003-12-22 06:22:29) |

Under Proof of Anything (in Logic) Posted on 2003-12-13 (44 Comments) |

| Self-referential logic saved my life. by Eric (2003-12-14 02:46:32) |

Under Lost the Key (in Logic) Posted on 2003-12-11 (18 Comments) |

| Solution by Eric (2003-12-11 21:25:33) |

Under The Amazing Stamp (in Geometry) Posted on 2003-12-01 (45 Comments) |

| re: by Eric (2003-12-01 23:41:24) |

Under Relativistic bullet (in Science) Posted on 2003-11-28 (20 Comments) |

| re(2): What a doppler effect! by Eric (2003-11-28 22:46:36) |

| re: What a doppler effect! by Eric (2003-11-28 21:59:53) |

| What a doppler effect! by Eric (2003-11-28 19:06:26) |

Under Feed the Birds (in Logic) Posted on 2003-11-28 (31 Comments) |

| re(2): solution by Eric (2003-11-29 03:44:34) |

Under Sides Of A Triangle (in Just Math) Posted on 2003-11-23 (14 Comments) |

| re(2): arithmetic progression? by Eric (2003-11-23 12:17:11) |

Under Bull's eye! (in Shapes) Posted on 2003-11-22 (16 Comments) |

| first thoughts by Eric (2003-11-22 12:41:16) |

Under Cutting Corners (in Shapes) Posted on 2003-11-20 (16 Comments) |

| sdrawkcabbackwards? by Eric (2003-11-20 15:35:46) |

Under Norse Code (in Word Problems) Posted on 2003-11-18 (16 Comments) |

| re(2): Paging Dr. Huckstable by Eric (2003-11-20 00:10:20) |

| Paging Dr. Huckstable by Eric (2003-11-19 22:40:27) |

Under Three numbers (in Just Math) Posted on 2003-11-17 (21 Comments) |

| shaving the sphere by Eric (2003-11-18 21:24:48) |

Under 50 - Digit Number (in Just Math) Posted on 2003-11-15 (39 Comments) |

| a little more straightforward by Eric (2003-11-16 01:07:26) |

Under Circle in hypotenuse (in Geometry) Posted on 2003-11-14 (13 Comments) |

| re(2): solution by Eric (2003-11-16 01:23:03) |

Under Strike a Chord (..Any Chord) (in Geometry) Posted on 2003-10-09 (51 Comments) |

| keep it simple, ... by Eric (2003-10-09 22:52:33) |

Under Landscape Architect (in Shapes) Posted on 2003-09-27 (9 Comments) |

| Solution by Eric (2003-09-27 13:07:39) |

Under What Happened ? (in Numbers) Posted on 2003-09-23 (9 Comments) |

| now we are learning by Eric (2003-09-27 13:24:10) |

Under Marbles Bonanza (in Paradoxes) Posted on 2003-09-08 (83 Comments) |

| I lost my marbles by Eric (2003-09-08 23:34:58) |

Under Lumber Netters (in Numbers) Posted on 2003-09-08 (9 Comments) |

| Solution to 2 by Eric (2003-09-09 00:15:19) |

Under Towers of Hanoi (in Algorithms) Posted on 2003-09-07 (21 Comments) |

| Holy Hula Hoops! by Eric (2003-09-07 10:12:37) |

Under Move the 6, Quadruple the Number (in Numbers) Posted on 2003-09-04 (6 Comments) |

| solution by Eric (2003-09-05 00:27:27) |

Under Words in Common 3 (in Word Problems) Posted on 2003-09-03 (12 Comments) |

| GOT IT! by Eric (2003-09-08 01:42:03) |

| thinking out loud by Eric (2003-09-07 20:29:14) |

Under Super Number Square (in Numbers) Posted on 2003-08-19 (7 Comments) |

| solution by Eric (2003-09-05 02:17:34) |

Under Men, Women and Pets (in Logic) Posted on 2003-02-21 (23 Comments) |

| h is right! - Comprehensive Solution by Eric (2005-04-26 01:05:04) |

Under pH of water again (in Science) Posted on 2003-02-15 (8 Comments) |

| re: guess by Eric (2003-11-29 22:47:34) |

Under The Letter (in Logic) Posted on 2002-12-08 (27 Comments) |

| Another Solution by Eric (2005-04-29 02:26:44) |

Under Circular Logic II (in Geometry) Posted on 2002-07-19 (3 Comments) |

| re: A solution by Eric (2003-09-07 10:01:59) |

Under Self-Descriptor (in Numbers) Posted on 2002-07-10 (14 Comments) |

| re: 6210001000 by Eric (2003-11-16 00:56:03) |

| re: another possible answer by Eric (2003-11-16 00:55:12) |

Under Coffee and Cream (in General) Posted on 2002-06-21 (10 Comments) |

| Density by Eric (2005-05-02 22:28:13) |

Under Pearls (in Weights and Scales) Posted on 2002-05-23 (9 Comments) |

| Solution for any P by Eric (2005-11-29 23:21:44) |

Under A Bookworm’s meal (in General) Posted on 2002-04-19 (12 Comments) |

| Voila! by Eric (2003-10-22 21:24:50) |